{"id":"a62c8b5b-398a-491c-b096-c464e53492c1","shortId":"72PegA","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com serves NFT metadata for token ID 73 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and settle on the Base L2 network using USDC. The platform advertises no rate limits, no minimums, and instant access.\n\nThis specific endpoint (/api/v1/nfts/73/metadata) returns metadata for a particular NFT. The exact schema of the returned metadata is not documented — there is no OpenAPI spec, no example responses, and the crawled docs pages beyond the landing page only show a \"Connect wallet\" prompt. The endpoint is confirmed live via a 402 challenge captured during probing.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response format and fields are completely undocumented","Only serves metadata for NFT token ID 73 at this specific path; generality is unclear","Docs, pricing, and README pages return only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/73/metadata","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/73/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond the landing page. The specific NFT metadata content is entirely 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'/request':16,32,146 '0.02':15,31,57,73,145 '000':67 '20':66 '402':219 '6':71 '73':43 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':168 'account':78 'advertis':160 'ai/ml':116 'analysi':119 'analyt':115 'api':75,112 'attach':82 'base':5,21,62,68,153 'base-network' 'beyond':202 'broader':105 'call':9,25,55,111 'caller':81 'captur':221 'challeng':220 'classif':121 'confirm':215 'connect':209 'convers':138 'cost':56 'crawl':199 'data':114,124 'decim':72 'doc':200 'document':188 'embed':122 'endpoint':3,19,34,141,171,213 'estim':132 'exact':180 'exampl':195 'exchang':127 'feed':126 'finance/web3':123 'gas':131 'gate':48 'generat':139 'geocod':136 'header':87 'host':103 'id':42 'infer':117 'infrastructur':134 'instant':167 'json':96 'key':76 'l2':154 'land':204 'limit':163 'live':216 'lowpaymentfee.com':36,102 'maxamountrequir':64 'metadata':2,18,39,97,174,185 'minimum':165 'model':148 'need':80 'network':63,155 'nft':1,17,38,178 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':192 'page':201,205 'particular':177 'pay':7,23,109 'pay-per-cal':6,22,108 'pay-per-call' 'pay-per-request NFT' 'payment':52,86,92 'per':8,24,110 'platform':159 'post':46 'price':125,147 'probe':223 'prompt':211 'proof':93 'protocol':53 'provid':101 'quot':130 'rate':128,162 'receiv':95 'request':47 'respons':196 'return':99,173,184 'schema':181 'sentiment':118 'serv':37 'settl':150 'share':142 'show':207 'span':113 'spec':193 'specif':170 'suit':106 'summar':120 'token':41,129 'token metadata' 'unit':69 'usdc':13,29,59,157 'usdc-settlement' 'use':156 'util':135 'valid':90,137 'via':10,26,44,217 'wallet':210 'x':85 'x-payment':84 'x402':11,27,51,91 'x402 NFT' 'x402-payment'","prices":[{"id":"51f948b6-9f7d-411e-9209-22b9d9b2788e","listingId":"a62c8b5b-398a-491c-b096-c464e53492c1","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/73/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.792Z"}],"sources":[{"listingId":"a62c8b5b-398a-491c-b096-c464e53492c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/73/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.792Z","lastSeenAt":"2026-04-22T05:32:24.017Z"}],"details":{"listingId":"a62c8b5b-398a-491c-b096-c464e53492c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/73/metadata \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/73/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/73/metadata"}],"useCases":["Fetching metadata for NFT token #73 programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT metadata retrieval without API key management"],"bestFor":["Developers needing keyless, pay-per-call NFT metadata access","AI agents that can settle micropayments via x402 on Base","Quick one-off metadata lookups without account setup"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 73 at this path)","Users who need detailed API documentation or response schema guarantees","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.469Z"},"updatedAt":"2026-04-22T05:32:24.017Z"}}